foo.cc: In function 'int main()':
foo.cc:69:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |     scanf("%d%d%d",&n,&m,&D);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:73:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   73 |         scanf("%s",a);
      |         ~~~~~^~~~~~~~

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